Chelant screening and refinement tests - Phase I, Task 2. Topical progress report, December 1993--June 1994 Page: 59 of 236
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It is recommended to continue to test both of the basic solvent systems in the bench scale
and pilot plant phases of the program:
(1) EDTA, ammonium carbonate, and hydrogen peroxide: pH 9.0 with NH4OH
(2) ammonium carbonate and hydrogen peroxide: pH 9.0 with NH4OH.
From the data generated to date, the carbonate/peroxide solvent should be effective for
removal of surface uranium contamination. The addition of chelant appears necessary for
decontamination of surfaces where the contamination is buried deeper in the metal surfaces. In
this case, the EDTA results in the necessary higher base metal corrosion during the 93*C
application phase of the decontamination process. It is further recommended to utilize the
application sequence as described in Section 9.0 for, the bench scale and pilot plant test.
It is also recommended that additional foam tests be performed with a more suitable test
coupon. This could be actual contaminated material, if available. The low temperature
application temperature and the relatively short time required for uranium dioxide dissolution
make the EDTA/carbonate/peroxide solvent particularly adaptable to foam cleaning.
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Chelant screening and refinement tests - Phase I, Task 2. Topical progress report, December 1993--June 1994, report, July 1, 1995; United States. (https://digital.library.unt.edu/ark:/67531/metadc680875/m1/59/: accessed April 18, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.